Source: Icon Sportswire / Getty The NFL and the Dallas Cowboys organization are mourning the death of defensive end Marshawn Kneeland, who died from a self-inflicted gunshot wound on Nov. 6. He was 24. The second-year player was involved in a police chase in the hours leading up to his untimely demise, according to PEOPLE. But his loved ones believe his struggles with mental health, compounded with the loss of his mother two months before the NFL draft last year, contributed to his tragic end.